Self-threading shuttle



- sept. 1s, 192s. 1,684,731

c. RICARD SELF THREADING SHUTTLE Filed sept. 1927 Patented Sept. 1,8, 1928.

UNITED STATES CHRISTY RICARD, OF'WOONSCKET, ESAND.

SELF-THREADNG SHUTTLE.

Application filed September 9, 13 2. Serial This invention relates to an improved selfthreading shuttle for looms and `constitutes an improvement upon the shuttle described and claimed in my copending application Serial Number 139,358 filed Uctober 4, 1926.

In shuttles employed prior to the invention of that shown in my copending application referred to above, various means have been employed for preventing removal of the thread from the forward e-nd of the thread n receiving passage., but none of the structures heretofore employed have combined with the means for preventing removal of the thread from the forward end of the thr ad receiving passage a positive locking means for prevent# ing removal of the thread from the rearward end of the threadreceiving passage without which the provision of such means at the forward end of the thread receiving passage is rendered ineffectual for the purpose intend ed, since in the start of the rearward movements of the shuttle .a loop will be thrown oil from the bobbin which will frequently i thrown forward a suliici distance to release the thread from the holding means at the forward end of the thread receivingV passage.

My copending application referred to above provides means for obviating this difficulty by reason of the provisionof a positive locking means at the rearward end of the thread receiving passage and the provision of a flexible holding member extending across the thread receiving passage adjacent to the forward end thereof.

In the present application I employ the same holding means at the rearward end of the thread receiving passage as that described in my prior application above mentioned, but have provided a slightly different and improved holding means at the forward end of the thread receiving passage.

One object of the present invention is to provide a self-threading shuttle of the character described which may be cheaply and easily constructed and which will positively7 lock the thread against removal from either end of the thread receiving passage.

Another object of my invention is the pro vision of a shuttle of this character which may be constructed almost entirely as a casting, and which contains the least possible number of elements liable to breakage or deterioration in use. v

Other objects and advantages of the in-v vention relate to various improved details of receiving passa usual cons No. ZlSAQS.

construction and novel methods of operation as will be more full,v set forth iu the detailed description to follow: i i

Referring to the drawings FigQ l is a perspective view of a portion of a self-threading shuttle embodying the present invention, and illustrating the position of the bobbintherein. Y

Y 2 is an enlarged sectionalview. taken i, the line of l. Fig. 3 is a perspe'tive view of thethread hloclr illustrating the thread locking means employed at the .forward end of the thread e, and l lfig. lis a t il sectional view, taken aloi'ig the line elM-/l of it In the enil odiment of .the invention illustrated herewith, the shuttle body l. 'is of the "ction and is provided with a chamber Q within wl li is located a .c 'fn 3 cari-ving the thread e of this character.

thread block 5, p i metal, is fitted wit ina su' j formed in the end with a t g L o coin munica"ing with and ormiug an erf;- tension of the thread receiving pa p formed in the shuttle bod 'Elie thred receivingv passage through tno thread block. 5 andl shuttle body is substantially straight throughout its length, and flexible blade 8 is anchored in one side of the thread block 5 adjacent to the rearward end of the thread receiving passage, as indicated at 9, and is provided with a curved end portion which,

is adapted to lie within a circular groove l formed upon the inner face of the thread receiving passage,

is shown in Fig' 1the flexible blade 8 which provides a positive locking for preventing escape of the thread from the thread receiving passage is located adjacent Vto the rearward or bobbin end of saidpassage.'

rlhe thread block may be formed entirely from cast instal with the exception of the flexible blade 8, and the thread receiving passage 6 formed therein communicates witl a side delivery eye l2 formed in one side of the bobhin thro glil .vhieh the thread normally passes du the reciprocation of the shuttle,

The inner face of one side wall 18 of the casting is provided with a` shallow longitudinal depression le located adjacent to the forward end of the thread receiving passage 6, and a projection 15 extends inwardly across the thread receiving passage and into the depression 14, the projection being curved downwardly near its end, to permit thev thread 4 to readily slide downwardly there-v over into the thread receiving passage in threading the shuttle. Vhen the thread has passed below the projection 15, it is positively7 held against removal by direct upward movement by the projection 15, the end of which tention of the saine in the passage at all times.

In placing the thread in the passage it is only necessary to layit across the threadblock,and, since the passage is straight, the tension will draw the thread downwardly into the passage under the flexible blade 8 and down over the downwardly slopingsurface of the projecting tip 15, and on the return movement ofthe shuttle after replenishment the thread will pass through the side delivery eye 12 adjacent to the groove 16 in the shuttle.

The construction shown herein is adapted to draw the `thread downwardly into the thread receiving passage on the first pick aliter replenishment when the thread is drawn under the flexible blade 8 and over the slop* ing end of the projection 15. It is then impossible for the thread to escape from the passage as it cannot be drawn directly upwardly past the projection 15 and the iexible blade 8 will hold it from looping forwardly from the hobbin past the end of the projection 15.

By utilizingthe projection 15 extending into the depression 14 at the forward end of the thread receiving passage, instead of a flexible member, the structure may be formed by casting, all except the flexible blade 8, and the liability of an exposed flexible member at the front of the thread receiving passage to hecoming bent or otherwise injurcdis entirely obviated. While the vpresent improvement is best adapted for use with the form of thread block having a straight thread receiving passage, as shown, it may be applied to and used in connection with any of the usual vtypes ofV thread blocks now generally employed.

What I claim is A In a self-threading shuttle, a thread block having a longitudinal thread receiving passage provided adjacent to one end thereof with a transverse groove, a curved resilient thread loclrlocated within the passage in said block adjacent. to one end of said passage so positioned as to permit insertion of the thread beneath the curved thread lock by downward. movement of the thread within the passage and having `the end thereof lying within the groove formed in the wall of said passage, a portion of said thread block forming one wall of said thread receiving passage and provided with a depression vlocated adj acent to the opposite end of said passage from the curved thread lock, and a downwardly Vinclined projection extending across said passage and having the end thereof located within the depression.

In testimony whereof I have affixed my signature.

Y CHRISTY RICARD 

